“for a change” homey “forgot” a sensor and i had to delete and pair again.
… Not really for a change, my homey does that all the time, average once a week.
This time resetting homey, restartimg the app, none let me add the device again.
I remembered some Fibaro screendrivers had the same issue: they only coupled directly.
So I dismounted the doorsensor, kept it next to homey and bingo, worked. Back at the door, still worked through a router.
These are the things that drive me to home assistant: this inconsequent and erratic zigbee notwork. 
